Ink-jet type recording head

An ink jet printer head, comprising:

• a spacer, including path holes for forming:
• pressure generating chambers continuous to nozzle openings,
• ink supply paths, and
• reservoirs;
• a cover member sealingly covering the pressure generating chambers;
• and
• pressure generating means for generating pressure in the pressure generating chambers in accordance with print data;
• wherein:
• the spacer comprises a silicon single-crystal substrate vertically oriented in (110);
• and
• the spacer is anisotropically etched so that one of the path holes that forms one of the pressure generating chambers has a respective wall that is continuous and straight with respect to a respective wall of one of the path holes that forms one of the ink supply paths;
• the spacer includes wall surfaces at said path holes;
• and
• all of said wall surfaces have a surface parallel with one of the four faces constituting a parallelogram with two different interior angles, and all of said wall surfaces have a crystal orientation of (111).

An ink-jet recording head, comprising:

• a nozzle plate provided with nozzle openings forjetting ink droplets;
• a spacer provided with pressure generating chambers, ink supply ports, and reservoirs;
• said nozzle plate being fixed to one surface of said spacer, a plate member fixed to another surface of said spacer so as to be opposite to said nozzle plate, said spacer and said plate member being sandwiched and fixed to each other, said nozzle openings each communicating with a respective one of said pressure generating chambers;
• and
• pressure generating means for applying a change of pressure to said pressure generating chambers to form said ink droplets;
• wherein the improvement comprises:
• said spacer is a single silicon crystal substrate having a crystal orientation (100);
• said pressure generating chambers, said ink supply ports, and said reservoirs are through-holes in said spacer and are in communication with each other;
• said spacer includes, at said through-holes, wall surfaces perpendicular to at least said one surface of said spacer, all of said wall surfaces having a surface parallel with one of the four faces constituting a parallelogram with two different interior angles, and all of said wall surfaces having a crystal orientation of (111);
• said spacer further comprises cantilevered partitions each having a respective fixed end and a respective free end, each of said partitions separating respective adjacent ones of said pressure generating chambers at said respective fixed end, each of said partitions separating respective adjacent ones of said ink supply ports at said respective free end;
• said spacer further comprises a body to which said respective fixed end of each of said cantilevered partitions is connected;
• said cantilevered partitions include a free end part and a fixed end part, said free end part being angled with respect to said fixed end part;
• said free end part has sides extending in parallel from said angle to the end of said free end part;
• and
• said through holes of said pressure generating chambers are substantially parallelogram shaped, each with only one respective comer having an actual acute angle, said only one respective comer being at a nozzle end of said pressure generating chamber.